Electrical transformer



Aug. 27, 1963 H. w. LAWSON, JR

ELECTRICAL TRANSFORMER Filed Aug. 3, 1959 INVENTOR. HARRY W LA WSON JR.

ATTORNEY i Electronics and Transformer Corporation, Caledonia, 1

N.Y., a corporation of New York Filed Aug. 3, 1959, Ser. No. 831,340 1 Claim. (Cl. 336-34) The present invention relates to electrical devices employing coils with multiple windings, and more particularly, to an electrical transformer.

One object of this invention is to provide a transformer having multiple windings in which the windings can be used individually, that is, separately from one another or in any number of multiple combinations.

A further object of the invention is to provide a transformer that has improved efiiciency and marked decrease in leakage reactance.

Another object of the invention is to provide an electrical coil having multiple windings and in which the start and finish leads of each winding are easily locatable and identifiable.

Another object of the invention is to provide an electrical coil having multiple windings, that can be wound easily by machine.

Other objects of the invention will be apparent hereinafter from the specification and from the recital of the appended claim.-

In the drawing:

FIG. 1 is a plan view of a transformer with multipleone arm of this core in a coil, denoted generally at 12,

is a flat, ribbon 14 that has a plurality of longitudinally parallel, laterally-spaced, flat, copper electrical conductors 15 embedded therein which constitute the windings of the transformer coil. The ribbon 14 is made of a film of transparent, flexible synthetic resin that has electrical insulating characteristics; and the conductors, which are embedded in the ribbon, are separated from one another in each layer by the film, and surrounded on all sides by the film. The ribbon is wound around the core in a plurality of layers; and the conductors 15 of successive layers are insulated from one another by the film. The

conductors 15, therefore, provide a plurality of windings insulated from one another and equal in number to the number of conductors embedded in the ribbon, nine in the instance shown. The coil is wound so that the conducto-r of each winding lies in its own plane at right angles to the axis of the coil, Hence, each winding is in a single plane and Wound spirally from the core outward.

The outer terminal end 14' of the ribbon is folded along a diagonal line 17 with respect to the main body of the coil of ribbon, as shownin FilG. 1, so that it extends axially away from the coil. The inner or starting end 14" of the ribbon is similarly folded upon the main body of the coil of ribbon to extend axially from the coil, but in the opposite direction to the outer end 14. The end portions 14 and 14" are preferably folded so that the conductors 15 at both ends of the ribbon are in alignment axially of the coil, as shown. However, this is a matter of choice.

At the two ends of the ribbon 14, a portion of the resin United States Patent 3,192,245 Patented Augi27, 1963 film is removed to expose the ends of the conductors 15, to provide leads for making electrical connections with thecoil windings. I I

To distinguish these leads from one another, the leads at one end of the coil are designated 21 to 29 inclusive, and the leads at the other end of the coil are designated 31 to 39 inclusive.

The nine windings can, of course, be used separately. By a displaced cable splice all nine windings can. instead, if desired, be placed in series. 'Ihus, lead 21 could be connected, to lead 32, lead 22 to lead 33, etc'. This would, of course, provide maximum inductance. Instead of so connecting the leads, the lead 21 can be connected, as'shown in FIG. 3, to lead 33, lead 23 can be connected -to lead 35, lead 25 to lead 37, and lead 27 to lead 39.

Lead 31 would then become one terminal of the primary,

and lead 29 the other terminal thereof. With this setup, lead 22 might then be connected to lead 34, lead 24 to lead 36, and lead 26 to lead 38. Lead 32 might then be one terminal of the secondary and lead 28 the other terminal thereof.

Obviously instead of displacing the lead connections by two as in the last described set-up, they might be displaced so that lead 21 was connected to lead 34, lead 24 to lead 37, and lead 27 tolead 39 so that leads 31 and 29 were the terminals of the primary, and lead 22 could be connected to lead 35, and lead 25 to lead 38 making leads 32 and 28 the terminals of the secondary.

In another arrangement, any one or several alternate windings may be used as intervening shields. Thus the conductor 15 Whose two lead ends are designated 21, 31, respectively, might be used as the primarywinding of the transformer, While the conductor 15 whose two lead ends are denoted 23, 33, respectively, might be used as the secondary winding of the transformer, and the intervening conductor whose two lead ends are denoted at 22, 32,

respectively, might be grounded to act as a shield between of the primary; and lead 23 could be connected to lead 36, and lead 26 to lead 39 so that leads 33 and 29 would be the terminal leads of the secondary; and lead 22 could be connected to lead 35, and lead 25 to lead 38, and leads 32 and 28 could be grounded so that a spiral shield of conductors would again intervene between the primary and secondary windings.

All] almost infinite number of permutations land combinations is available, therefore, the limits provided by the number of conductors in the ribbon 14. All of the windings can be used individually, or in any desired multiple combination; and any single, or several alternate windings, may be used as interwinding shields. Because each individual metallic conductor 15 is flat and forms a winding that is in substantially a single plane that is at right angles to the axis of the coil, transformer efiiciency is improved due to a marked decrease in leakage reactance.

The transformer construction described can, of course,

apply to all iron structures, including toroids, and can employ ribbon that has any desired number of conductors, at any desired spacing.

' While the invention has been described in connection with a specific embodiment thereof, then, it will be understood that it is capable of further modifications, and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains and as may be applied to the essential features lhereinbefore set forth, and as fall within the scope of the invention or the limits of the appended Having thus described 'my invention, what I claim is:

An electrical transformer comprising an iron core, a single ribbon of flexible electrically insulating plastic wound upon itself in' a spiral of a plurality of convolutions about said core to form the coil of the transfiormer, said rib'rbon having embedded therein in electrically-insulated relation a plurality of flat electrical conductors that are disposed lengthwise of said ribbon and that are latenally spaced from each other, at least one of said conductors t constituting the primary of the transformer, at least an- 10 other of said conductors constituting the secondary of the ffiransformer,.1and at least one conductor intervening between the-primary and secondary conductors being grounded to form a shield between the primary and the secondary.

References Cited inthe file of this patent UNITED STATES PATENTS Great Britain Sept. 18, 

